US6690531B2 - Dynamic tape path adjustment - Google Patents

Dynamic tape path adjustment Download PDF

Info

Publication number
US6690531B2
US6690531B2 US09/747,598 US74759800A US6690531B2 US 6690531 B2 US6690531 B2 US 6690531B2 US 74759800 A US74759800 A US 74759800A US 6690531 B2 US6690531 B2 US 6690531B2
Authority
US
United States
Prior art keywords
tape
head
guide
sensor
function
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime, expires
Application number
US09/747,598
Other languages
English (en)
Other versions
US20020080514A1 (en
Inventor
Durkee B. Richards
James S. Anderson
Leif O. Erickson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sony Corp
Original Assignee
Imation Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Imation Corp filed Critical Imation Corp
Priority to US09/747,598 priority Critical patent/US6690531B2/en
Assigned to IMATION CORP. reassignment IMATION CORP. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ANDERSON, JAMES S., ERICKSON, LEIF O., RICHARDS, DURKEE B.
Priority to JP2001382714A priority patent/JP2002208198A/ja
Priority to DE10162389A priority patent/DE10162389A1/de
Publication of US20020080514A1 publication Critical patent/US20020080514A1/en
Application granted granted Critical
Publication of US6690531B2 publication Critical patent/US6690531B2/en
Assigned to SONY CORPORATION reassignment SONY CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: IMATION CORP.
Adjusted expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
    • G11B15/60—Guiding record carrier
    • G11B15/602—Guiding record carrier for track selection, acquisition or following

Definitions

  • This invention relates to equipment used in electronic media reading and writing, and more particularly to systems using data recording tape.
  • Tape read/write head assemblies include one or more read/write transducer heads positioned transverse to the intended path of a recording tape.
  • the transducer heads write data on and read data from parallel tracks on the tape called “data tracks.”
  • the head assembly can move laterally across the width of the tape to position a particular transducer head relative to a particular data track, with the head assembly's position controlled by a servo.
  • the tape itself may include tracks called “servo tracks,” which provide information to control the lateral position of the head assembly.
  • Servo tracks serve as reference features or guide marks on the tape.
  • the head assembly can dynamically adjust the position of the transducer heads to keep the heads in a correct position relative to the tape tracks.
  • the tape path past the head assembly should not vary, but in practice lateral tape movement affects the position of a transducer head relative to a track. Dynamic repositioning is important because it compensates for the lateral movement.
  • Disturbances may arise, for example, from the equipment used to dispense the tape that is being fed past the transducer heads and from the equipment used to take up the tape after it had passed the transducer heads.
  • tape is dispensed from a first reel, which includes a hub and which often includes a flange, and is taken up by second reel. If a hub or a spindle supporting a reel is not perpendicular to the reel, the reel may wobble as it rotates. This wobble causes the tape to move laterally relative to the head assembly.
  • contact between the tape edge and the flange may produce lateral movement of the tape.
  • small pockets of air may become trapped between layers of tape, allowing one layer to slip laterally relative to another.
  • Another potential source of lateral tape motion may come about due to the interaction between the head assembly and the tape. At times when the head assembly moves laterally relative to the tape to find a particular track, friction between the head assembly and the tape causes the tape to adhere to the head assembly and “follow” the head assembly.
  • the lateral movements described above involve rapid changes in the lateral position of the tape relative to the head assembly, and other movements involve gradual changes.
  • the initial tape movement may be gradual. There may come a point, however, at which the tension in the tape overcomes the frictional force, and the tape rapidly snaps back to a previous position.
  • the invention provides systems that sense the lateral movement of data recording tape such as magnetic recording tape.
  • One system monitors the tape position and adjusts the tape path based upon the tape position.
  • Another system monitors the tape position and adjusts the position of the head assembly.
  • the systems will be described separately, but typically the systems cooperate with each other to compensate for rapid (or “high-frequency”) changes and for more gradual (or “low-frequency”) changes in tape position.
  • the present invention provides a system for positioning data recording tape.
  • the system includes a sensor that detects the position of the tape and issues a position signal as a function of the tape position.
  • the sensor may be, for example, an optical sensor or a magnetic sensor, and the signal may indicate how close the tape is to a target tape path.
  • the system also includes a guide that interacts with the tape and a controller that moves the guide as a function of the position signal. By moving, the guide steers the tape.
  • One technique for steering the tape with the guide is by tilting the guide.
  • the present invention presents a system for positioning a head for reading and writing to data recording tape.
  • the system includes a head, a sensor configured to detect the position of the tape and generate a signal as a function of the position, and a servo coupled to the head.
  • the servo is configured to move the head as a function of the signal.
  • the sensor is located such that the sensor detects the tape's position before the tape passes the head.
  • the system may also include an adaptive estimator, which receives the signal. Based upon the detected position or movement of the tape, the adaptive estimator may generate a second signal, which is used by the servo to move the head. With this system, the servo may move the head in anticipation of a disturbance that has not yet reached the head.
  • the present invention provides a method for steering data recording tape.
  • the method includes passing the tape over a guide, sensing the position of the tape, generating a signal as a function of the position, and moving the guide as a function of the signal.
  • the present invention provides a method for moving the head in anticipation of tape disturbances.
  • the method comprises detecting a disturbance in the path of the tape before the disturbance reaches the head, generating a signal as a function of the disturbance, and moving the head as a function of the signal.
  • the present invention presents a system that includes a sensor that detects the position of data recording tape and issues a position signal as a function of the position of the tape.
  • the system also includes a guide that interacts with the tape, a first controller that moves the guide as a function of the position signal, a head and a second controller that moves the head as a function of the position signal.
  • the controllers may send signals to each other.
  • the present invention presents a control method.
  • the method includes passing data recording tape over a guide and past a head.
  • the position of the tape is sensed, and a position signal is generated as a function of the position of the tape.
  • the method further includes moving the guide as a function of the position signal and moving the head as a function of the position signal.
  • FIG. 1 is a diagram of a tape guiding system.
  • FIG. 2 is a diagram of a movable tape guide.
  • FIG. 3 is a block diagram showing a feedback system.
  • FIG. 4 is a block diagram showing a feedback and feed forward system.
  • FIG. 1 shows a system 10 that guides a tape 12 past a read/write head 18 .
  • Tape 12 includes a lower edge 14 and an upper edge 16 .
  • Tape 12 is dispensed from some apparatus such as a first reel (not shown in FIG. 1 ), and is taken up by other apparatus such as a second reel (not shown in FIG. 1 ).
  • Tape 12 may travel past read/write head 18 from right to left or from left to right.
  • tape 12 is moving from left to right, tape 12 is dispensed and passes over a first guide 22 .
  • Tape 12 then passes head 18 .
  • Tape 12 passes over a second guide 26 before being taken up.
  • Head 18 moves up and down, allowing head 18 access to different tracks on tape 12 .
  • the position of head 18 is governed by a head servo 20 , which is controlled by a servo controller (not shown in FIG. 1 ).
  • head 18 is a magnetic head that reads data from and writes data to tape 12 , which is magnetic recording tape. In other embodiments, however, head 18 and tape 12 may be arranged for optical recording.
  • Guides 22 and 26 stabilize tape 12 as tape 12 moves past head 18 , and guides 22 and 26 maintain tape 12 in or near the “target,” or desired, tape path. Guides 22 and 26 steer tape 12 in a manner to be described in more detail below. Guides 22 and 26 may be roller guides with smooth cylindrical surfaces and have a low coefficient of friction with tape 12 . Guides 22 and 26 may rotate about axes 24 and 28 , respectively. Alternatively, guides 22 and 26 may be fixed, with tape 12 sliding over the guides or tape 12 flying on entrained air over the guides. As shown in FIG. 1, guides 22 and 26 do not include flanges to guide tape edges 14 and 16 . Interaction between tape edge 14 or tape edge 16 and a flange tends to cause damage to the edge and affects the quality of the edge.
  • guides 22 and 26 could have flanges, with the flanges being removed from the tape path.
  • the flanges would not serve to steer tape 12 during ordinary operation, but would serve as a safety feature to prevent tape 12 from slipping off guides 22 and 26 in rare cases of extreme tape movement.
  • Tape 12 may be housed, for example, in a tape cartridge. Some components of system 10 , including components described below, may be included in the tape cartridge. Alternatively, some components may be included in a tape drive that receives the cartridge and runs tape 12 past head 18 . Guides 22 and 26 , for example, may be mounted on a baseplate in the tape cartridge, or guides 22 and 26 may be mounted on a deck within the tape drive. The invention is intended to encompass system 10 without regard to whether its components are included in the cartridge, the driver, or any combination thereof.
  • Guides 22 and 26 are movable, with axes 24 and 28 being configured to change orientation.
  • a first guide actuator 34 regulates the orientation of axis 24 , and consequently regulates the orientation of first guide 22 .
  • a second guide actuator 36 regulates the orientation of axis 28 and consequently regulates the orientation of second guide 28 .
  • Guide actuators 34 and 36 by regulating the orientation of guides 22 and 26 , can cause one or both guides to tilt relative to an axis substantially perpendicular to a tape drive deck across which tape 12 is moved.
  • FIG. 2 shows first guide actuator 34 tilting axis 24 by an angle ⁇ to a tilted position 24 ′, causing guide 22 to move to a new position 22 ′.
  • the tilting creates unequal longitudinal tension in tape 12 .
  • Upper edge 16 is in greater tension than lower edge 14 .
  • tape 12 tends to slide downward on guide 22 to reduce the tension in upper edge 16 .
  • guide 22 places lower edge 14 in greater tension than upper edge 16 , thus steering tape 12 upward.
  • steering techniques may differ.
  • tape 12 When tape 12 crosses a rotating guide, tape 12 may not necessarily move in a direction to decrease tension, and may be drawn in some circumstances in a direction that increases tension. Tape 12 may still be steered however by tilting guide 22 , but the tilting techniques may be different from the techniques employed when guide 22 is fixed.
  • FIG. 2 The tilting shown in FIG. 2 is for purposes of illustration and is not intended to limit the invention.
  • a tilt fulcrum 38 where axes 24 and 24 ′ cross, is depicted near the bottom of guide 24 , but fulcrum 38 may be positioned at any other location, including a location other than one coincident with axes 24 or 24 ′.
  • actuator 34 can be configured not only to tilt axis 24 of guide 22 , but also to translate guide 22 in one, two or three dimensions. For example, actuator 34 can move guide 22 downward, thus steering tape 12 downward.
  • FIG. 2 shows only first guide 22
  • second guide 26 can be configured to move in a similar manner.
  • sensors 30 and 32 are positioned between guides 24 , 28 and the reels that dispense or take up tape 12 .
  • Sensors 30 and 32 are shown monitoring upper edge 16 of tape 12 , but sensors 30 and 32 could also monitor lower edge 14 . Additional sensors may also be added, the additional sensors allowing upper edge 16 and lower edge 14 to be monitored simultaneously, for example, or monitoring edge positions between guides 24 , 28 and head 18 .
  • Sensors 30 and 32 may generate electrical signals indicative of the position of upper edge 16 .
  • Sensors 30 and 32 may be optical sensors. Optical sensors offer good sensitivity and high accuracy, i.e., optical sensors are capable of monitoring upper edge 16 position very precisely. Furthermore, optical sensors also provide large bandwidth, i.e., optical sensors respond quickly to rapid changes in tape position. The invention is not limited to optical sensors, however. Sensors 30 and 32 may be other kinds of sensors, such as magnetic sensors configured to sense a magnetic track near the edge of tape 12 .
  • output signals from sensors 30 and 32 can be used by first guide servo 34 and second guide servo 36 to position first guide 22 and second guide 26 .
  • Output signals from sensors 30 and 32 can be also used by head servo 20 to position read/write head 18 .
  • FIG. 3 is a block diagram illustrating a feedback system 40 .
  • a tape position set point 42 representing the ideal upper edge 16 position when tape 12 is aligned with the target tape path, is the input to feedback system 40 .
  • the actual upper edge 16 position 50 is the output to feedback system 40 .
  • the upper edge 16 position is sensed 48 by sensor 30 .
  • the actual position 50 is subtracted 44 from the ideal position 42 , resulting in an error signal 52 .
  • a guide controller that manages guide servo 34 steers tape 12 toward the target position, thus driving the error signal to zero.
  • a similar feedback system may be employed with edge sensor 32 and guide 26 .
  • FIG. 4 is a block diagram illustrating a feedback/feed forward system 60 .
  • Feedback/feed forward system 60 uses signals from sensors 30 and 32 to correct for read/write head 18 position errors and to anticipate movement of tape 12 .
  • feedback/feed forward system 60 uses some common components as feedback system 40 , such as sensors 30 and 32 , the two systems 40 and 60 are shown as separate block diagrams for clarity.
  • Input to feedback/feed forward system 60 is the desired position of head 18 ( 62 ), relative to a point on tape 12 .
  • the desired position of head 18 may be specified, for example, with respect to a particular data track or a particular servo track.
  • Servo controller 72 places head 16 at a position relative to the tape ( 74 ).
  • the actual head position relative to tape 12 ( 74 ) is negatively fed back ( 64 ) to correct for errors in the position of head 18 .
  • the actual position ( 74 ), subtracted ( 64 ) from the desired position ( 62 ), produces an error signal ( 78 ), which is used by servo controller 72 .
  • Tape disturbance 70 such as a high-frequency tape lateral motion, may affect the position of the head 18 with respect to tape 12 ( 74 ). Tape disturbance 70 also affects the position of tape 12 as detected by sensor 30 or 32 ( 68 ). Because many disturbances 70 are detected by sensors 30 or 32 before they reach head 18 , an adaptive estimator ( 66 ) may use sensor 68 signals to feed forward ( 64 ) signals to servo controller 72 to anticipate impending motion caused by tape disturbance 70 . As a result, servo controller 72 can position head 18 quickly when the disturbance reached head 18 , and can wholly or partially compensate for the disturbance when the disturbance reaches head 18 .
  • Adaptive estimator 66 may include, e.g., a differentiator to convert position signals from a sensor 68 to signals indicative of the velocity of tape movement. Adaptive estimator 66 may further include instructions or logic for recognizing tape disturbances caused by head 18 itself. For example, adaptive estimator may correlate tape position 68 with signals 76 from servo controller 72 to recognize cases in which friction between head 18 and tape 12 causes tape 12 to adhere to head 18 and follow head 18 . In such a case, adaptive estimator 66 may feed forward signals to counteract the feedback signals, thus keeping head 18 stationary. The advantage of counteracting is that it prevents head 18 from trying to pursue a track on tape 12 that friction prevents head 18 from reaching.
  • feedback system 40 and feedback/feed forward system 60 have been described separately above, and although systems 40 and 60 may operate alone or independently, it is usually advantageous for systems 40 and 60 to cooperate with each other. Cooperation allows improved compensation for high-frequency changes and low-frequency changes in tape position.
  • feedback system 40 may send a signal to feedback/feed forward system 60 that shows that feedback system 40 is steering tape 12 downward.
  • Feedback/feed forward system 60 may use that signal to adjust the head position to follow the downward motion of tape 12 .

Landscapes

  • Adjustment Of The Magnetic Head Position Track Following On Tapes (AREA)
US09/747,598 2000-12-22 2000-12-22 Dynamic tape path adjustment Expired - Lifetime US6690531B2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US09/747,598 US6690531B2 (en) 2000-12-22 2000-12-22 Dynamic tape path adjustment
JP2001382714A JP2002208198A (ja) 2000-12-22 2001-12-17 動的なテープ経路の調整
DE10162389A DE10162389A1 (de) 2000-12-22 2001-12-19 Dynamische Bandweg-Einstellung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US09/747,598 US6690531B2 (en) 2000-12-22 2000-12-22 Dynamic tape path adjustment

Publications (2)

Publication Number Publication Date
US20020080514A1 US20020080514A1 (en) 2002-06-27
US6690531B2 true US6690531B2 (en) 2004-02-10

Family

ID=25005797

Family Applications (1)

Application Number Title Priority Date Filing Date
US09/747,598 Expired - Lifetime US6690531B2 (en) 2000-12-22 2000-12-22 Dynamic tape path adjustment

Country Status (3)

Country Link
US (1) US6690531B2 (de)
JP (1) JP2002208198A (de)
DE (1) DE10162389A1 (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7342738B1 (en) 2006-10-20 2008-03-11 Imation Corp. Positioning head assembly for data storage system with multiple degrees of freedom
US20100202083A1 (en) * 2009-02-06 2010-08-12 Nhan Xuan Bui Setting edge stress signal in magnetic tape data storage cartridge memory in response to servo detection error signals
WO2011092642A1 (en) 2010-01-28 2011-08-04 International Business Machines Corporation Method and apparatus for operating a storage device
US8861121B2 (en) 2012-10-25 2014-10-14 Oracle International Corporation Closed loop control of tape media positioning within tape drive using position error signal feedback
US20150062747A1 (en) * 2013-08-30 2015-03-05 International Business Machines Corporation Aligning a first element coupled to an actuator with a second element of a main system
US9230590B1 (en) 2014-12-11 2016-01-05 International Business Machines Corporation Dynamic adjustments of tape head wrap angles

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6775092B2 (en) * 2001-12-07 2004-08-10 Quantum Corporation Lateral tape motion sensor
US20060103968A1 (en) * 2004-11-12 2006-05-18 Jurneke Joe K Dynamic skew compensation systems and associated methods
JP2006252644A (ja) * 2005-03-10 2006-09-21 Matsushita Electric Ind Co Ltd 磁気ヘッド位置の調整方法及び装置
US20060256465A1 (en) * 2005-05-11 2006-11-16 Biskeborn Robert G Tape system with dynamically controlled flangeless rollers
US7423833B1 (en) 2005-12-13 2008-09-09 Marvell International Ltd. Servo loop employing correction vector from a secondary disturbance sensor to minimize correlation between servo loop error and disturbance sensor output
JP4150065B1 (ja) * 2007-03-12 2008-09-17 日立マクセル株式会社 磁気テープ装置
US11935563B2 (en) * 2022-03-10 2024-03-19 Western Digital Technologies, Inc. Tape drive having independently controlled tilting tandem tape heads

Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2938962A (en) * 1955-07-12 1960-05-31 Konins Azimuth seeking reproducing head
US4058841A (en) * 1974-11-27 1977-11-15 Sony Corporation Magnetic tape recording and/or reproducing apparatus with device for recording and/or reproducing control signals
US4392163A (en) * 1979-09-28 1983-07-05 U.S. Philips Corporation Magnetic tape recording and/or reproducing apparatus with automatic head positioning
US4675760A (en) * 1986-03-11 1987-06-23 Ampex Corporation Information signal recording and/or playback system and method using a prerecorded reference track
US4875127A (en) * 1988-04-06 1989-10-17 Eastman Kodak Company Apparatus and method for precise tape guiding in a magnetic tape transport
US5333770A (en) * 1990-03-01 1994-08-02 Hitachi, Ltd. System for controlling tape traveling height and tape guide with tape edge detector therefor
US5379165A (en) * 1993-03-19 1995-01-03 Tandberg Data A/S Method and apparatus for improving the accuracy of a tape servo track seek algorithm by using longitudinally correlated waveforms of lateral tape movement unique to each tape cassette
US5737003A (en) 1995-11-17 1998-04-07 Imation Corp. System for registration of color separation images on a photoconductor belt
US5901011A (en) * 1995-08-24 1999-05-04 Lg Electronics Inc. Tape guide angle controlling apparatus for magnetic tape recorder-player
US5946156A (en) 1997-03-04 1999-08-31 Imation Corp. Tape servo system and methods, write/read heads, and servo track configurations regarding same
US5978003A (en) 1997-06-30 1999-11-02 Imation Corp. Belt position detection system for belt registration in an electrophotographic imaging system
US6067213A (en) * 1996-07-12 2000-05-23 Deutsche Thomson-Brandt Gmbh Tape stepper for transverse track positioning in a multitrack tape recorder
US6118630A (en) 1998-04-23 2000-09-12 International Business Machines Corporation Compliant edge guiding and following system for tape
US6131840A (en) 1991-11-28 2000-10-17 Fujitsu Limited Mechanism for preventing uneven take-up of tape

Patent Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2938962A (en) * 1955-07-12 1960-05-31 Konins Azimuth seeking reproducing head
US4058841A (en) * 1974-11-27 1977-11-15 Sony Corporation Magnetic tape recording and/or reproducing apparatus with device for recording and/or reproducing control signals
US4392163A (en) * 1979-09-28 1983-07-05 U.S. Philips Corporation Magnetic tape recording and/or reproducing apparatus with automatic head positioning
US4675760A (en) * 1986-03-11 1987-06-23 Ampex Corporation Information signal recording and/or playback system and method using a prerecorded reference track
US4875127A (en) * 1988-04-06 1989-10-17 Eastman Kodak Company Apparatus and method for precise tape guiding in a magnetic tape transport
US5333770A (en) * 1990-03-01 1994-08-02 Hitachi, Ltd. System for controlling tape traveling height and tape guide with tape edge detector therefor
US6131840A (en) 1991-11-28 2000-10-17 Fujitsu Limited Mechanism for preventing uneven take-up of tape
US5379165A (en) * 1993-03-19 1995-01-03 Tandberg Data A/S Method and apparatus for improving the accuracy of a tape servo track seek algorithm by using longitudinally correlated waveforms of lateral tape movement unique to each tape cassette
US5901011A (en) * 1995-08-24 1999-05-04 Lg Electronics Inc. Tape guide angle controlling apparatus for magnetic tape recorder-player
US5737003A (en) 1995-11-17 1998-04-07 Imation Corp. System for registration of color separation images on a photoconductor belt
US6067213A (en) * 1996-07-12 2000-05-23 Deutsche Thomson-Brandt Gmbh Tape stepper for transverse track positioning in a multitrack tape recorder
US5946156A (en) 1997-03-04 1999-08-31 Imation Corp. Tape servo system and methods, write/read heads, and servo track configurations regarding same
US5978003A (en) 1997-06-30 1999-11-02 Imation Corp. Belt position detection system for belt registration in an electrophotographic imaging system
US6118630A (en) 1998-04-23 2000-09-12 International Business Machines Corporation Compliant edge guiding and following system for tape

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7342738B1 (en) 2006-10-20 2008-03-11 Imation Corp. Positioning head assembly for data storage system with multiple degrees of freedom
US20100202083A1 (en) * 2009-02-06 2010-08-12 Nhan Xuan Bui Setting edge stress signal in magnetic tape data storage cartridge memory in response to servo detection error signals
US7929243B2 (en) * 2009-02-06 2011-04-19 International Business Machines Corporation Setting edge stress signal in magnetic tape data storage cartridge memory in response to servo detection error signals
US8587892B2 (en) * 2010-01-28 2013-11-19 International Business Machines Corporation Method and apparatus for operating a storage device
US20120293889A1 (en) * 2010-01-28 2012-11-22 International Business Machines Corporation Method and apparatus for operating a storage device
DE112011100370T5 (de) 2010-01-28 2012-12-27 International Business Machines Corporation Verfahren und Vorrichtung zum Betreiben einer Speichereinheit
WO2011092642A1 (en) 2010-01-28 2011-08-04 International Business Machines Corporation Method and apparatus for operating a storage device
DE112011100370B4 (de) 2010-01-28 2022-02-10 International Business Machines Corporation Verfahren und Vorrichtung zum Betreiben einer Speichereinheit
US8861121B2 (en) 2012-10-25 2014-10-14 Oracle International Corporation Closed loop control of tape media positioning within tape drive using position error signal feedback
US8982493B2 (en) 2012-10-25 2015-03-17 Oracle International Corporation Closed loop control of tape media positioning within tape drive using position error signal feedback
US20150062747A1 (en) * 2013-08-30 2015-03-05 International Business Machines Corporation Aligning a first element coupled to an actuator with a second element of a main system
US9190088B2 (en) * 2013-08-30 2015-11-17 Globalfoundries Inc. Aligning a first element coupled to an actuator with a second element of a main system
US9230590B1 (en) 2014-12-11 2016-01-05 International Business Machines Corporation Dynamic adjustments of tape head wrap angles
US9484056B2 (en) 2014-12-11 2016-11-01 International Business Machines Corporation Dynamic adjustments of tape head wrap angles

Also Published As

Publication number Publication date
DE10162389A1 (de) 2002-06-27
US20020080514A1 (en) 2002-06-27
JP2002208198A (ja) 2002-07-26

Similar Documents

Publication Publication Date Title
US6690531B2 (en) Dynamic tape path adjustment
JP4278001B2 (ja) 磁気テープの記録再生方法および記録再生装置
JP5511992B2 (ja) サーボ・トラックのゼロ基準に対するスキュー・アクチュエータによるサーボ検出方法、及びそのシステム
US6963467B2 (en) Method and apparatus for compensating for media shift due to tape guide
US8982493B2 (en) Closed loop control of tape media positioning within tape drive using position error signal feedback
US4913328A (en) Active tape tracking system with crown guide rollers for magnetic recorder/players
EP0149888A1 (de) Servosystem für ein Datenaufzeichnungssystem und ein zugehöriges Datenaufzeichnungssystem
US20060256465A1 (en) Tape system with dynamically controlled flangeless rollers
US20060103968A1 (en) Dynamic skew compensation systems and associated methods
US6775092B2 (en) Lateral tape motion sensor
JPS5853419B2 (ja) ウエブユソウソウチ
US6633449B1 (en) High bandwidth tape positioning system and servo controlled rollers for active tape positioning
US7881008B2 (en) Joint specification of servo format and servo reader parameters for tape drive systems
JP2014502772A (ja) フランジレス・テープ・パスのためのテープ・ドライブの高速な中心点補正のためのシステムおよび方法
US20030099166A1 (en) Method and apparatus for long seeking control of pickup head
US8587892B2 (en) Method and apparatus for operating a storage device
US20060175450A1 (en) Passive air bearing tape guide
US8134797B2 (en) Application of continuous position error offset signal to acquire servo track
US7046466B1 (en) Dual density recording for direction-dependent linear media
EP1605452A2 (de) Adaptive Rollenführung für Bandantriebsvorrichtung
JP2001093211A (ja) テープ走行装置及びそれを使用したテープ書き込み装置
US8488266B2 (en) Adjustment of tape reel height
JP2005310193A (ja) 磁気記録装置及び磁気テープのトラッキング方法
US20030107837A1 (en) Guided servo writing for data storage media
JP2005339689A (ja) サーボ信号記録装置およびサーボ信号記録方法および磁気テープおよびデジタルデータ記録再生装置。

Legal Events

Date Code Title Description
AS Assignment

Owner name: IMATION CORP., MINNESOTA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:RICHARDS, DURKEE B.;ANDERSON, JAMES S.;ERICKSON, LEIF O.;REEL/FRAME:011427/0627

Effective date: 20001222

STCF Information on status: patent grant

Free format text: PATENTED CASE

FPAY Fee payment

Year of fee payment: 4

FPAY Fee payment

Year of fee payment: 8

FEPP Fee payment procedure

Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

FPAY Fee payment

Year of fee payment: 12

AS Assignment

Owner name: SONY CORPORATION, JAPAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:IMATION CORP.;REEL/FRAME:036354/0980

Effective date: 20150803